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106cc Kt100 torque monster build for super cheap..
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Tim Brown



Joined: 12 Nov 2009
Posts: 71

PostPosted: Tue Feb 26, 2013 9:14 pm    Post subject: Reply with quote

Well I thought with the 50mm stroke it would have a very strong bottom end and wouldn't have to use the L-2, nothing against the L-2, and could try to capture some of that top end hp... is this not the way to do it?? thoughts...
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Walt Gifford



Joined: 19 Jul 2002
Posts: 4390
Location: United States, South Jerrrsey,

PostPosted: Fri Apr 12, 2013 6:22 pm    Post subject: Reply with quote

The L4 will give you useable power in a narrow rpm range. If your track has you going from 0 to 60 allot then you're going to be getting max power for a smaller percentage of your lap. What ever advantage the longer stroke gives you won't make up the difference on a sprint track imho.

I've seen the L3 on shorter tracks but they run a high clutch stall, long flex and are careful not to overwind the pipe. I wouldn't try it on less than a 1/2 mile course.

How's the build going, did you get it running? Just wondering if you've had any vibration issues using that crank.

Gif Cool
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FAA certified jet engine and aircraft technician
Nicholson Speedway class champion 2001
Yamaha KT100 Service Center
40 years karting experience
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Tim Brown



Joined: 12 Nov 2009
Posts: 71

PostPosted: Sun Apr 14, 2013 9:33 pm    Post subject: Reply with quote

My first set of cases were not machined very will in the bearing pockets, so the bearing would not go in and the cases were heated to 375. Im taking them in and getting rechecked at a real kart shop, CMC in tigard OR.
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Gordon Duax



Joined: 22 Dec 2009
Posts: 139
Location: United States, Texas, San Antonio

PostPosted: Wed May 08, 2013 11:23 pm    Post subject: Reply with quote

I'm expecting a PRD crank in next week, so I am still very interrested in this thread Smile
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Walt Gifford



Joined: 19 Jul 2002
Posts: 4390
Location: United States, South Jerrrsey,

PostPosted: Thu May 09, 2013 7:37 am    Post subject: Reply with quote

Aren't those cranks close to $400?
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Gordon Duax



Joined: 22 Dec 2009
Posts: 139
Location: United States, Texas, San Antonio

PostPosted: Thu May 09, 2013 8:03 am    Post subject: Reply with quote

I found a used one in Japan Smile
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Tim Brown



Joined: 12 Nov 2009
Posts: 71

PostPosted: Thu May 09, 2013 9:56 pm    Post subject: Reply with quote

Hey sorry guys that this project isn't move along very fast, got stuck building two engines and a few races, I put way to much on my plate... should be back on it very soon. Its great to see the interest and some actually building their own as we go...that's what this forum is all about!!

My buddy's a Machinist and has too much money and too much time on his hand, so he is machining out Billet kt100 engine cases and maybe billet water cooled heads like the two part Rotax design, great for open classes or practice engines
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Walt Gifford



Joined: 19 Jul 2002
Posts: 4390
Location: United States, South Jerrrsey,

PostPosted: Fri May 10, 2013 6:55 am    Post subject: Reply with quote

ARC makes a water cooled cylinder that fits right on the KT100.
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Tim Brown



Joined: 12 Nov 2009
Posts: 71

PostPosted: Fri May 10, 2013 6:42 pm    Post subject: Reply with quote

Hey there Walt, I think the ARC head mates up with the waterjacket on the ARC cylinder, this would be just the head...
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Walt Gifford



Joined: 19 Jul 2002
Posts: 4390
Location: United States, South Jerrrsey,

PostPosted: Thu May 23, 2013 6:08 pm    Post subject: Reply with quote

Any pics of those billet crankcases? Sounds awesome. Also, what kind of drive system are you using? I understand the PTO is for direct drive or a belt drive and is too short for a clutch.


Gif Cool
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FAA certified jet engine and aircraft technician
Nicholson Speedway class champion 2001
Yamaha KT100 Service Center
40 years karting experience
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Chris Parks



Joined: 09 Sep 2001
Posts: 1510
Location: Australia, not USA state,

PostPosted: Sun Jun 16, 2013 1:36 am    Post subject: Reply with quote

Use head inserts if you have a machinist with the time to make them

http://www.vhm.nl/?navi=cylinderheads

You can set the squish and comp to suit yourself and set the cylinder height where you want it.
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understeer happens on road courses and usually is pronounced with a British accent. Push happens on ovals and usually is pronounced through a wad of chew. Other than that, I don't think there's a difference - Jim Derrig


Chris
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